<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            width: 50%;
            height: 100px;
            /* border: 3px red solid; */
            /* 1.边框的粗细 */
            border-width: 3px;
            /* 边框的颜色 */
            border-color: blue;
            /* 边框的样式 */
            border-style: dotted;
            /* 
                solid:实线
                dashed:虚线
                dotted:点线
            */
            /* 没有顺序 */
            border: solid 8px chartreuse;

        }

        a {
            border: 1px red solid;
        }

        input {
            border: 1px pink solid;
            /* 去除表单获取焦点的样式 */
            outline: none;
        }
    </style>
</head>

<body>
    <div></div>
    <a href="">1</a>
    <input type="text">
</body>

</html>